Luminaire cap



FIG. 1 is a perspective view of a luminaire cap showing the new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a side elevational view shown in a use environment.

The broken line environmental showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a luminaire cap, as shown and described. 